Sharpener tool for razor blades



Jan. 7, 1930. R. B. STANFORD SHARPENER TOOL FOR RAZOR BLADES Filed Aug. 12, 1927 Patented Jan. 7, 1939 UNITED STATES PATENT OFFICE,

RALPH IB. STANFORD, OF BALTIMORE, MARYLAND, ASSIGNOR TO ZERVA STANFORD,

OF SHREWSBURY, PENNSYLVANIA SHARPENER TOOL FOR RAZOR BLADES A plication filed August 12, 1927. Serial No. 212,431.

This invention relates to sharpener-tools for razor blades, knives and similar cutting edges and has for its object to provide a tool that may be manufactured at very small cost;

which will effectively sharpen the edges of blades and knives without requiring skill and which will protect the hand of the operator from injury during the sharpening operation.

The inventionis illustrated in the accompanying drawing, wherein,

' the line 3-3 of Fig. 1, and

Fig. 4 illustrates the sharpening element in perspective and detached from the guard or case.

Referring to the drawing, the numeral 5 designates a flat plate having a straight longitudinal lower edge 6, and at its opposite and upper longitudinal edge said plate being provided with a series of sharpening'lugs 7, which curve upwardly and laterally in one direction and a second series of sharpening lugs8, which curve upwardly and laterally in a direction reverse to that of the series of lugs 7 These two sets or series of sharpening lugs 7 and 8 are alternately arranged along the upper edge of the fiat plate and their reverse inclinations are slight with respect to a central vertical plane between them so as to form long V-shaped spaces 9 between adjacent and reversely inclined edges 10 of adjacent lugs.

Each lug of both series of lugs 7 and 8, is concavo-convex in cross-section or in a horizontal direction, with the convex surface 11 formed on one side of one lug and the convex surface of the next lug formed on the opposite side of the latter lug so that the reverse sides of adjacent lugs will be convex.

By thus providing opposite faces of adja cent lugs with convex surfaces in a direction crosswise of the lugs and then curving one lug laterally in one direction and the next lug laterally in a reverse direction, I locate the convex surfaces on opposite sides of a plane passing between the two sets of lugs, and on a longitudinal line down between the two'sets of lugs, I form V-gaps 12 between the high Q point of the convex surface of one lug and the high point of the convex surface of the next lug.

After the plate is formed, I enclose it in a metal sheathing or case 13 which latter has one longitudinal edge-14, turned down inwardly over the upper horizontal edges of the series of lugs 7 From said upper edges of the lugs 7, the case curves downwardly close against the outer sides of the series of lugs 7, then extends under the lower longitudinal edge 6 of the plate at 15, and then extends upwardly at the opposite side of the plate, curving outwardly as it hugs close against the outer sides of the lugs 8 and finally has its other upper edge 16 turned inwardly and downwardly over the upper edges of the seriesof lugs 8.

I have found that in order to hold the plate snugly within the sheathing or case, it is simpler to form the hooks or down-turned edges 14'16 on the case; then fold the case so the dimension between the lower fold edge and the upper edge under the hooks will be greater than the dimension from the upper edges of the lugs 7 and 8 to the lower edge 6 of the plate. Then the plate may be pushed down through the slit 17 until the upper edges of the lugs spring under the edges 1416 of the case but the plate will then be loose in the case between the upper hooks and the lower, folded edges.

By then turning the case up-side-down and tapping it on an object, the lugs of the plate will be made to slide under the clown-turned edges 14.16 of the case and when in this position, I compress the lower folded edge 15 of the case into a flat longitudinal flange and thus bind the plate and hold it rigidly in the case.

The sheathing or case 13 therefore has a 7 18 at the ends of the case to prevent endwise movement of the plate 5 in the case and to completely enclose said plate.

By thus providing a sheathing or case around'the plate 5'and covering the opposite sides thereof, the tool may beheld in the hand while the blade is being sharpened and by covering the sharpening lugs 7 and 8 protect the fingers of the operator.

A blade such as indicated in broken lines 19 in Fig. 4, or by full lines 20 in Fig.3 may be inserted in the slit 17 between the convex surfaces 11 of the two sets of lugs and when w reciprocate'd therebetween will be sharpened by rubbing over those convex surfaces as it is pressed down into the V gap 12 between the bases of the two sets of sharpening lugs 7 and 8.

Having described my invention, I claim,' 1. A sharpening tool comprising a rectangular sheet-metal sheathing having two side walls which curve outwardly in reverse directions near their upper edges and each wall having an inwardly down-turned flange along its upper edge, a plate inserted between said sheathingwallsand having two series of re- 7 versely -inclined lugs along its upper edge,-. the lugs of one set having their upper edges inserted under the inwardly down-turned flange on one ofthe sheathing-walls while the lugs of the other set have their upper edges inserted under the inwardly downturned flange on the other sheathing-wall and the lower edge of the sheathing having its 7 two walls clinched together beneath the lower edge of the inserted plate to hold the plate up and keep the lug-edges-np under the inwardly down-turned flanges ofthe sheathing.

V 2. A sharpening tool comprisinga rectangular metal plate having a series of lugs along its upper edge the alternate lugs being concavo-convexed in a vertical direction so they will curve outwardly from, one side of the plate while the intervening lugs are concavoconvexed vertically in a reverse direction so they will curve outwardly from the opposite side of said plate,the lugs at both sides also i being concavo-convex in a crosswlse direc-' tion and the cross-wise convex surfaces of the two sets of lugs facingtoward each other so that the sharp side edges of the lugs will be i turned backwhile the high portions of the crosswise concavo-convex surfaces will form a channel to receive the edge of tool to be sharpened.

In testimony whereof I aflix my signature.

RALPH B. STANFORD. 

